50p to 25p Conversion - A Quick Guide Converting Sony 50P MTS to smooth 25P MP4
Is there a way to interpret the MTS footage at 1080/50p and edit at the frame rate, and then later convert to 25p mp4 and maintain the same cuts for playing?
Source From: How to Convert Sony 50P MTS to 25P MP4 easily
I need to convert files from a Sony camera from 50p MTS to 25p MP4. Because I found there still is no HDD media player support my 1080 50p MTS files well, nor does it appear any HD TV supports it with internal media player. Looking around for any decent tutorials, I’ve finish the Sony 50P MTS to 25P MP4 conversion task.
I've used Brorsoft MTS/M2TS converter to transcode the 1080/50p MTS to 25p MP4 with big success. Overall, this MTS converter is highly compatible with diverse 1080p, 1080i, 720p AVCHD MTS files from Sony as well asCanon, Panasonic, Leica and more. With it, you can fast convert 1080/50p MTS to 25p MP4 with best quality. What's more, it also allows you to transcode MTS to AVI, WMV, MOV, MPG, FLV, etc. various video formats with excellent audio and image quality for using in video editing software like Sony Vegas, Adobe Premiere, Windows Movie Maker, Pinnacle Studio, etc. or playback with multimedia devices like iPhone, iPad, Galaxy Tab, etc.
If you are running on Mac OS X(including El Capitan, Yosemite, Mavericks), you can turn to MTS/M2TS Converter for Mac. 
( Note: Click here for OS X 10.5)
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Guide: Transcoding Sony 50P MTS to 25P MP4
Step 1: Load source files
Launch the best MTS/M2TS Converter. Click the "Add" button on to load your 50p .mts files. If you would like to join MTS files together, just select these files and check the "Merge into one" box. 
Step 2.: Select output format
Click on "Format" bar, and select output format from the drop-down list. H.264 and MPEG-4 encoded MP4 formats are available. For some common portable devices, special output formats are listed for you, such as Android, iPad, iPhone and so on. 
Step 3: Adjust 50p to 25p
Click the "Settings" to set parameters for your devices. You can easily modify the frame rate from 50p to 25p as you need. 
Step 4: Start conversion
Hit the Convert button to start the 1080/50p Sony MTS to 25p MP4 conversion. When it finished, you can get the output videos by clicking Open button. Then it would be free to play, upload and share the videos anywhere you want.
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